Note 1263 — Chapter XII · THE TRUE GNOSTIC IS BENEFICENT, CONTINENT, AND DESPISES WORLDLY THINGS.
William Wilson translation
According to the text, instead of “to witness,” as above, it would be “not to witness.” Lowth suggests the omission of “not” (μη). Retaining it, and translating “is not even for children to witness,” the clause yields a suitable sense.